LXR linux/fs/9p/vfs

   1/*
   2 *  linux/fs/9p/vfs_dentry.c
   3 *
   4 * This file contians vfs dentry ops for the 9P2000 protocol.
   5 *
   6 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   7 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   8 *
   9 *  This program is free software; you can redistribute it and/or modify
  10 *  it under the terms of the GNU General Public License version 2
  11 *  as published by the Free Software Foundation.
  12 *
  13 *  This program is distributed in the hope that it will be useful,
  14 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 *  GNU General Public License for more details.
  17 *
  18 *  You should have received a copy of the GNU General Public License
  19 *  along with this program; if not, write to:
  20 *  Free Software Foundation
  21 *  51 Franklin Street, Fifth Floor
  22 *  Boston, MA  02111-1301  USA
  23 *
  24 */
  25
  26#include <linux/module.h>
  27#include <linux/errno.h>
  28#include <linux/fs.h>
  29#include <linux/file.h>
  30#include <linux/pagemap.h>
  31#include <linux/stat.h>
  32#include <linux/string.h>
  33#include <linux/inet.h>
  34#include <linux/namei.h>
  35#include <linux/idr.h>
  36#include <linux/sched.h>
  37#include <net/9p/9p.h>
  38#include <net/9p/client.h>
  39
  40#include "v9fs.h"
  41#include "v9fs_vfs.h"
  42#include "fid.h"
  43
  44/**
  45 * v9fs_dentry_delete - called when dentry refcount equals 0
  46 * @dentry:  dentry in question
  47 *
  48 * By returning 1 here we should remove cacheing of unused
  49 * dentry components.
  50 *
  51 */
  52
  53static int v9fs_dentry_delete(struct dentry *dentry)
  54{
  55        P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
  56                                                                        dentry);
  57
  58        return 1;
  59}
  60
  61/**
  62 * v9fs_cached_dentry_delete - called when dentry refcount equals 0
  63 * @dentry:  dentry in question
  64 *
  65 * Only return 1 if our inode is invalid.  Only non-synthetic files
  66 * (ones without mtime == 0) should be calling this function.
  67 *
  68 */
  69
  70static int v9fs_cached_dentry_delete(struct dentry *dentry)
  71{
  72        struct inode *inode = dentry->d_inode;
  73        P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
  74                                                                        dentry);
  75
  76        if(!inode)
  77                return 1;
  78
  79        return 0;
  80}
  81
  82/**
  83 * v9fs_dentry_release - called when dentry is going to be freed
  84 * @dentry:  dentry that is being release
  85 *
  86 */
  87
  88void v9fs_dentry_release(struct dentry *dentry)
  89{
  90        struct v9fs_dentry *dent;
  91        struct p9_fid *temp, *current_fid;
  92
  93        P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
  94                                                                        dentry);
  95        dent = dentry->d_fsdata;
  96        if (dent) {
  97                list_for_each_entry_safe(current_fid, temp, &dent->fidlist,
  98                                                                        dlist) {
  99                        p9_client_clunk(current_fid);
 100                }
 101
 102                kfree(dent);
 103                dentry->d_fsdata = NULL;
 104        }
 105}
 106
 107const struct dentry_operations v9fs_cached_dentry_operations = {
 108        .d_delete = v9fs_cached_dentry_delete,
 109        .d_release = v9fs_dentry_release,
 110};
 111
 112const struct dentry_operations v9fs_dentry_operations = {
 113        .d_delete = v9fs_dentry_delete,
 114        .d_release = v9fs_dentry_release,
 115};
 116